Omnipure Super Stabiliser Calcite & Corosex Filter. The media of the Super Stabiliser is quite different than a lot of filters. Calcite is a crushed, white marble media, and neutralized by acidic water by raising the PH. The Corosex is adapted for use in filters as a special processed, hard magnesia bead, which increases the pH value to neutralize acidity. The Granulated Activated Carbon cleans and clears the water absorbing any chemicals such as chlorine or odour and makes the water taste great.